Mold for insulating an armature



Nov. 22, 1932. v. G. APPLE MOLD FOR INSULATING AN ARMATURE Filed Feb. 5,1950 Patented Nov. 22, 1932 VINCENT G.ArrLE,or DAYTON, oHIo v MOLD FOBINSULATING lAIRMATUBE `Application led Februaryu3g1930. Serial No.r425,685.`

This invention relates to molds for in-y sulating armatures andparticularlyl for armatures comprising a core, a winding, and acommutator, the winding being composed of 5 magnet wire which ispreferably 4covered with a layer of fibrous or other absorptivematerial. y Y .0

The object of the invention is to provide a mold comprising means tohold the core and the cominutatorin suitably spaced apart relation, andthe winding to a definite shape, while fluid insulation is forced'in',through and about the turnsof the winding and over the joints betweenthe-winding and the com l mutator, where it may be hardened while themold is stillin place, to theend Vthat all of the .uid insulation. usedwill be retained and be held in proper shapev while` it is `beinghardened, that the; several parts .may be permanently held in properrelatlon thereby, and that the covering thus formed willpreventtheabsorption o? oil, moisture or other foreign matter thewindingand M protect vit agamstphysical injury.

a I attain this object by the structure here-` inafter described,reference being had to the draWing.whereiIi-. V i

' Fig. l is an enlarged topplan view of' y the mold on 'a reducedscale.f

Fig. 2 is an axial 1cross section taken at 2 -2 ofFig.'1. i'

Fig.V 3 is atransverse Sectio of Fig. 2.

0"," of Fig. 2.

Fig.` 5 is atop planview of a segmental' v D side diameter of thecommutator 13and supporting ring. v

Fig. 6. is a detail view of one ofthe parts 40. of the mold.

throughout the several views.

The armature 10 comprises "a sleeve. 11V upon which is fitted the core12 and ,the com- `mutator 13. The winding iscomposed'of a plurality ofturns of cotton or similarly .cov-

:0. headsV 14 and`1'5 extend beyond the ends .of u 'the core as incommon practice.

n taken at a- Fig..4 isa transverse section taken at Similar numeralsreferto similar parts-r The commutator13lis of somewhat unusualconstruction being composed of la Ynum-v ber ofV segments 16- imbeddedin the coref17 of insulation. An annular vgroove 18 encircles the outersurface dividing'the risers 55.

19 from the brush track 21. While the core 17 extends voutwardly'betweentheV segments 16 to keep them spaced apart', it does not extend entirelyto the brush track but onlyv to the'line 22, thus leaving spaces23extending 60 lengthwise between adjacent segments as deep `as theannular groove 18, forming what is generally termed an undercutcommutator. The vbrush track 21 maybe trued up when necessary by takingcuts across its di- 65:

ameter'from the outer end and ending in the annular groove 18 withoutdanger of cutting` into the risers 19. f

Since the commutator is of the undercut variety the mold for insulatingthe armature 701 .must necessarily provide means to keep the insulationfrom iillingthe grooves23, and.l accordlngly suitable metal spacers aremade.

` a part ofthe mold. i p Y n The base'26,.in the main, is in the form 75of a rectangular plate `but has an integral collar 27 extending upwardlyfrom its` upper surface. A smooth round opening 28 extends`verticallythrough the collar and base and.

lis enlarged at 29 and still further enlarged 80 at 31. A steppedmember32 having vthreev outside diameters corresponding to the base openings28, 29 and131 respectively is held lnplace by screws 37. .Member 32 hascentral openings of three sizes 38, 39 and 41, the- 85' opening 38 beingequal to the extreme outthe parts 39 and 41 being filled in by thestepped plug 42.. l

Member32 is cutwith a series of. equally spaced radial slots 43corresponding to the segments of the commutator in number and to thespace between .them in thickness. Thesev slots extend from the top ofthe memy ber4 32 through its two upper diameters tothe 895 line44. Thesheet'metal spacers 46 are .then put in the slots, and occupy notonly'all ot the space removed when cutting the slots but. extendinwardlyinto the opening 38 to'iill the empty space vbetween the commutator seg-655 placed in a suitable oven ,and baked *Since and the main cylinder 52has Vanannul-ar r'ib 53 which fits freely in counterbore 51. Cyl-vrinder 52 has an opening 54Y of'uniforin diameter all the way through.. Aring 56.1its freely in opening 54 and has a central opening shaped`tossuit thewinding head `15, and

an inwardly'turned annular'rib 57 whichffitsV intothe groove 18V ofthecommutator,.and in order to be enabled to remove the collar 56 afterthe larmature has been insulated it is separable as at 58 into threeparts. `The core 12 rests on the upperedgeof ring 56 and it is in thismanner that the core and commutator are held positively spaced apartwhile the process of insulating the armature is taking place. Y

Theplunger 59 has a central opening 61 to lit freely'over sleeve 11 andis hollowed out at its lower end to go over the winding head 14. Thelower end otplunger 59 ultimately.

rests'on the core 12 whereupon the upper'end comes flush with the top ofcylinder 52 as shown. The tapped opening 62 is placed so as to come overone of the winding slots of the armature core. Opening 62 may be used asafvent to permit the escape of excess liquid when'the plunger59 is being:pressed Ydownir into place, and it -may be left open when baking thestructure to permit .the escape of gases generated by `the heat ofbaking.

Inoperation the plate 48 is laid over .the collar 27- ot base 26 withithe length Yof the plates at right angles to each other see Fig. 1) Thearmature lO'is then put upright with the commutator 13 inserted intheopening 38,

the spacers 46 extending into the spaces 28.`

The three kpart ring Y56 is now put around head 15 and the maincylinder.52 `is putover the ring with the rib'53 in the counterbore 51. Ameasured quantity oi thel fluid insulation is nowpoured into the Ytop ofcylinder 52 and the plunger 59 is inserted and pressed downward inasuitable press tothe position shown.

After the liquid insulation has been injected -into the mold asdescribed Ythey liquid must be converted into a Vsolid .and the processnecessary torso converting itdepends on the nature of. the liquid beingused. Most of the commercial insulating varnishes are susceptible ofbeing converted into a solid by the application of heat-,and where thiskind of insulation is employed the entire structure comprising .the moldand its contents may be the mold is transferred from the press to anoven, suitable clamping means not shown for holding the mold partstogether while baking is taking place must be provided.

When the insulation is sufficiently hard the armatureisremovedfromthemold. Since the rectangular base, 26 and therectangularplate 48 of themold .are assembled with th-eirlongestdimensions at right angles one to the other, each projects over theother (see Fig. 1) in -suchamannerthat the plate 48 may be readily heldVwhile the base 26 is pushed oft' of 'themold pullingthe spacers 46 ofthemold a from Athe spaces .230i the commutator. The plate 48 may thenbetaken oii' easily since it is'fitted freely tothe rib 53 anddoesnotmake contact with any other member. tune together with the plunger-59andthe ring 56-are now pushed endwise from 'the cylinder- 52. Theplunger 59 and-the collar 56 may tion at a time, whereupon the armaturewill be insulated.`

Having described a kmold embodying my invention,I claim-f- Y f 1. Inamold `for insulating an armature, thecombination of an oblong basehaving 'a collar extending upwardly from its upper surface, saidcollarhaving an internal di# ameter Aadapted to 'receivel thecommutator, an oblong plate having an opening itting freelyv over saidcollar, said base and said plate being assembled with vtheir longestydimensions the one at right rangles to theother, a cvlindersupportedjon said plate concentric with said collar, airing fittedyinthe lowerend of said cylinder having a central opening shaped to thefront windinghead anda plunger fitted in the upper-end of saidcylinderhaving a central opening Winding head.' l y 2. For insulating anarmature comprising a core,va winding-on saidcore, and acommutatoraxially spaced apart from said core, said co-mmutator having an annulargroove extending around its outer diameter between the lactiveportionwof the commutator and the risers, a mold comprising, incombinationa base portion to contain the active `portion of thecommutator, a main cylinder 4extending upwardly from said base portion,said main cylinder having an -internal diameter equal to the outsidediameter of said armature core, a ring slidably fitted to the lowerend'of said main cylinder, said ring having an axial length equal to thedistance from the armature core to the active portion of the saidcommutator and an annulus at its lower end fitted to the annulargroovein said commutator,said ring being composed lof a number ofseparate segments, and a plunger,

having its lower end hollowed out to `suit the'- The armanow-bevremoved, the collarradially one sec-I shaped 'toy-the, back mall).

3. For insulating an armature comprising a core, a winding on said core,and a commutator axially spaced apart from said core, said commutatorhaving open spaces between the segments at the active surface, a moldhaving a lower section to receive the active portion of said commutator,said lower section comprising in combination, sheet metal spacersequalin number, in spacing and in thickness to said open spaces in saidcommutator but wider and longer and having outwardly extending L ends atthe bottom, a stepped member having a cylindrical upper portion of twooutside diameters, the smaller outside diameter at the top, and twoinside diameters, the larger inside diameter at the top, said largerinside diameter corresponding to the outside diameter of the commutator,said cylindrical upper portion having slots to receive said L shapedsheet metal spacers, said slots completely containing said L shapedspacers except where they extend radially inward into said inside upperdiameter of said cylindrical upper portion, a base portion having twoinside diameters to fit over the two said out-side diameters of lsaidcylindrical upper portion, and a plug to fit the smaller of the two saidinside diameters. f In testimony whereof I atlix my signature.

VINCENT G. APPLE.

